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erlangcouchbasehostnameerl

Configure Couchbase 2.2 to use short hostname

I need to configure Couchbase 2.2 to use short hostname.

Currently I am using Couchbase 2.0.1 and in this case the solution was easy:

  1. Set Short hostname in /opt/couchbase/var/lib/couchbase/ip and /opt/couchbase/var/lib/couchbase/ip_start files.
  2. Change extra="-name ns_1@$ip" for extra="-sname ns_1@$ip" in _start() function into /opt/couchbase/bin/couchbase-server. This parameter was used to run erl (-run ns_bootstrap -- $extra)

This steps allows me to configure the node with the short hostname and create the cluster based on these.

In Couchbase 2.2 I can't do that because erl runs using babysitter. I try to configure babysitter to use short hostname but I couldn't make it work...

The servers were deployed in an a private Virtualization environment that only handle short hostname.

Each node has 2 ips, one public and one private. If I run a ping command from itself i get their private IP and I run ping a command from any other node I get their public IP.

For example, if I have one node: myhost-00 (private IP: 192.168.8.170 public IP: 10.254.171.29)

from itself:

$ ping myhost-00
PING myhost-00 (192.168.8.170) 56(84) bytes of data.

from other node:

$ ping myhost-00
PING myhost-00 (10.254.171.29) 56(84) bytes of data.

Any ideas?

Solution

  • I figured out a workaround:

    Firstly, I don't modify any of the Couchbase files.

    Secondly, I add a fake domain to my short hostname in each /etc/hosts file. In the file I append the private IP for the current node and the public IP for other nodes with the fake domain.

    For example, assuming I have 2 hosts: 
myhost-00 (private IP: 192.168.8.170 public IP: 10.254.171.29) 
myhost-01 (private IP: 192.168.8.168 public IP: 10.254.171.30)

myhost-00 /etc/hosts file:
...
192.168.8.170 myhost-00.mydomain
10.254.171.30 myhost-01.mydomain
...

myhost-01 /etc/hosts file:
...
10.254.171.29 myhost-00.mydomain
192.168.8.168 myhost-01.mydomain
...

    Finally, I create de cluster using the hostnames with the fake domains (myhost-00.mydomain and myhost-01.mydomain)